Atmosphere and Environment

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Across
  1. 4. The toxic, air polluting gas that causes acid rain is --------
  2. 5. Colour of liquid oxygen is -------
  3. 9. The excessive growth of algae in lakes causing harm to other living things is called ---------
  4. 11. 78% of total air is ----------
  5. 12. --------- is an inert gas that makes up about 0.97%
Down
  1. 1. --------- is an effect of air pollution
  2. 2. The substances that contaminate the air are called ---------
  3. 3. Natural cause of air pollution
  4. 6. Presence of undesirable components in the air causes -------
  5. 7. ---------- forms 21% of total air.
  6. 8. --------- layer protects the living organism from UV rays
  7. 10. ----------- is composed of many gases